{
  "cveId": "CVE-2021-28834",
  "url": "https://patchblox.com/security/cve/CVE-2021-28834",
  "summary": "CVE-2021-28834 is fixed in 2 products on 1 platform, first by kramdown 1.17.0-4ubuntu0.2, released March 19, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "kramdown: Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary class...",
  "description": "Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.",
  "published": "2021-03-19T00:15:00Z",
  "severity": "Medium",
  "epss": 0.02695,
  "epssPercentile": 0.85992,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "kramdown",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.17.0-4ubuntu0.2",
      "fix": "kramdown 1.17.0-4ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-kramdown-1.17.0-4ubuntu0.2",
      "released": "2021-03-19T00:15:00Z"
    },
    {
      "platform": "linux",
      "product": "ruby-kramdown",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.17.0-4ubuntu0.2",
      "fix": "ruby-kramdown 1.17.0-4ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-ruby-kramdown-1.17.0-4ubuntu0.2",
      "released": "2021-03-19T00:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}